(!!) (Recommended Single) 6EM7 GE Amperex Globe Logo NOS 1970 era (2.5ma/36ma)
6EA7 GE USA black base rebranded Zenith 1960 used/good (3.6ma/35ma)
6EM7 GE gray plates NOS 1960 (2.2/30ma)
6EM7 RCA coin-base black plates NOS 1970's broken guide pin (2.4ma/50ma)
6EM7 RCA coin-base black plates used/good 1970's (2.6ma/63ma)
6EM7 RCA coin-base used (2.5ma/28ma)
6EM7 Sylvania coin-base NOS 1970's (1.0ma/42ma)
6EM7 Westinghouse Korea NOS 1981 (1.2ma/65ma)
